Improvement in picks



- which may be of various forms.

UNITED ESTATES PATENT OFFICE.

WILLIAM L. coUsLAND, A0E PHILADELPHIA, PENNSYLVANIA, Ass'IGNoE 0ETwo-TEIEDs His EIGHT To JAMEs v. LAEEERTY AND WILLIAM cous- LAND, (AGENTnon A. LEADBEATEE.)

|MPRovl-:MENT IN PICKS- v Specification forming part of Letters PatentNo. 174,201, dated February 29, 1876; application filed l January 26,1876.

exact description of the nature thereof, sufficient to enable othersskilled in the art to which my invention appertains -to fullyunderstand,

make, and use the same, reference being had to the accompanyingdrawings, making part ot' this specification, in 'which- Figure 1 is aside view .of the pick embodying my invention. Fig. 2 is an end viewthereof. .Figs 3 and 4v are views ot' bits of the pick. Fig. 5 is asectional view thereof in line m x, Fig. 3. Fig. 6 is a transversesection in line y y, Fig. l.

Similar letters ot' reference indicate corresponding parts in theseveral figures.

My invention consists of a pick whose headis formed with a socket orsockets for the reception of detachable bits, the bits and socket beingirmly held by wedging-joints.

Referring to the drawings, A represents the yhead of the pick, in theend or ends of Which is. a socket, B, for the reception of bits G, .0ntheinner face of the socketthere is an inwardly-projecting wedge-shapedtongue, D, and onthe face of the bit there is a V'or wedge-shapedgroove, E, or vice versa, the location of the tongge and bit being suchthat when the bit is fitted in the socket the tongue will enter thegroove. v

and groovev will wedge against each other,

and the bight thus occasioned causes the bit to be rmly held in thesocket, whereby there will be no loosening, rattling, or unintentionaldisengagement of the parts, and as the kjoint wears .away the wedgingprovisionv will be preserved.

Having thus described my irrvention, what I claim as new, and desire vtosecureby Letters 1. The pick-head A formed with an end socket, B, whoseinner face is formed with a wedge-shaped tongue or groove, substantiallyas and for the purpose set forth.

2. The pick-head A formed with an end socket, B, and the detachable bitC tted to the socket by a wedging-joint, and held by means of aset-screw, F, passing through the wall ot' the socket, substantiallyA.as and for the purpose set forth.

w. L. coUsLAND.

Witnesses: J oHN A. WIEDEEsHEIM, A. P. GRANT.

